distro/fedora: remove empty s390x architecture

Fedora distro definition contained an empty `s390x` architecture with no
image types added to it. Let's remove it from the distro definition,
since it's adding no value in its current form.

Signed-off-by: Tomáš Hozza <thozza@redhat.com>

internal/distro/fedora/distro.go

@@ -893,11 +893,6 @@ func newDistro(version int) distro.Distro {
 		distro: &rd,
 	}
 
-	s390x := architecture{
-		distro: &rd,
-		name:   distro.S390xArchName,
-	}
-
 	ociImgType := qcow2ImgType
 	ociImgType.name = "oci"
 
@@ -1101,8 +1096,6 @@ func newDistro(version int) distro.Distro {
 		minimalrawImgType,
 	)
 
-	s390x.addImageTypes(nil)
-
-	rd.addArches(x86_64, aarch64, s390x)
+	rd.addArches(x86_64, aarch64)
 	return &rd
 }

internal/distro/fedora/distro_test.go

@@ -494,7 +494,7 @@ func TestArchitecture_ListImageTypes(t *testing.T) {
 
 func TestFedora_ListArches(t *testing.T) {
 	arches := fedora.NewF37().ListArches()
-	assert.Equal(t, []string{"aarch64", "s390x", "x86_64"}, arches)
+	assert.Equal(t, []string{"aarch64", "x86_64"}, arches)
 }
 
 func TestFedora37_GetArch(t *testing.T) {
@@ -510,7 +510,12 @@ func TestFedora37_GetArch(t *testing.T) {
 			name: "aarch64",
 		},
 		{
-			name: "s390x",
+			name:          "s390x",
+			errorExpected: true,
+		},
+		{
+			name:          "ppc64le",
+			errorExpected: true,
 		},
 		{
 			name:          "foo-arch",